Patent GB-155564-A (GB)
Title: Improvements in lathes and other rotary metal working machines
IPC: B23Q5/14
Filed: 1920-09-28
Abstract: 155,564. Conradson, C. M. Dec. 15,1919, [Convention date]. Turning; driving machines.-A lathe driven from a constant-speed shaft is provided with a wide range of speeds both for the spindle and for the automatically reversible traversing feed by easily controlled means which may also he incorporated in other metal-cutting machines. The driving-pulley 35 is keyed to a sleeve 38 loose on the end of the driving-shaft 30 and carried by a trunnion 33. A bevel-gear 50 integral with the sleeve engages bevel-gears 44 in a planetary gear 46, the gears 44 also engaging a bevel 47 keyed to the driving-shaft and to the friction clutch member 48. By means of a sliding collar 56 actuated by a hand-operated yoke lever, wedge blocks may be forced between cam-arms to expand clutch rings 52, 53 and thus engage the planetary carrier either with the clutch member 48 to drive the shaft 30 in the same direction as the pulley or with a fixed rim 49 to reverse the drive. In the neutral position of the collar, the driving-shaft remains stationary. If the drive be derived from an electric motor, the above-described reversing-gear may be dispensed with. The driving-shaft carries a series of six fixed gears 61 engaging gears normally loose on the hollow end of a countershaft 63 carrying a clutch member 93 fixed to a pinion 73 which, through gears loosely mounted on a sleeve on the driving-shaft, drives a clutch member 79 at a reduced speed. A sleeve 80 driving the lathe spindle through herring-bone gears 81, 82 carries a clutch collar 87, which is operated similarly to the main drive reversing-mechanism and may be clutched alternatively to the members 75, 79 to give two speeds to the lathe spindle for each speed of the countershaft 63. The six speeds of the latter are controlled in pairs by means of rods 95, 96, and 97 operated by shifter bars 102 mounted below a gridiron plate 104 and selectively engaged by a swinging lever 105. Bevelled campieces 118, Fig. 8, actuate adjustable wedge bolts 117 so that, by longitudinal movement of a campiece through the corresponding shifter bar, the wedge bolts may be moved radially to lock any required gear to the shaft. The feed-screw 140 is driven through the multi-speed gearing shown in Fig. 7 from a shaft 143, which is driven from a shaft geared to a pinion 125 on the spindle and having a reversing-device operated automatically by means of an arm connected through suitable mechanism to a rod 200 having adjustable trip blocks 202, which coact with a bracket on the tool-carriage to move the rod 200 and reverse the feed. Further provision is made for manually stopping or reversing the feed. The shaft 143 carries four fixed gears engaging gears 144, which are loose on a shaft 146 and may be locked thereto by means of a spring-pressed sliding key 167 operated by a shifter collar 170, spacer rings 172 being provided to prevent the simultaneous engagement of two gears. Further fixed gears 145 engage loose gears mounted on the feed-screw shaft and operated in a similar manner from a shifter collar 175. Thus 28 feed-screw speeds are available, and these may be varied bv means of change-wheels in the feed-screw driving-train. The collars 170, 175 are respectively operated through suitable mechanism by a lever 176 and graduated dial plate 177 conveniently mounted on the front of the machine. Spindle mountings.-The spindle is provided with a ball thrust bearing.